Tire.



, Mr C, OVERMAN.

TIRE.

APPLICATION HLED APR.18. |914. Y

Patented Jam-9,1917.

2 SHEETS-SHEET l- Inventor:

Meal/gg@ M. C. OVERMAN.

TIRE.

APPLICATION FILED APR. I8. 19H.

'Patented Jan. 9, 1917'l i 2 sains-SHEET 2.

Inventf:

Arty

UNiTED STATES PATENT OFFICE; cYnUsdv-nnmnnoF-Nnw ironx, 1v. Y.

To all whom it may concern :V

Be it known that I, MAX 'CYRUs OvnRMAN, a citizen of the United States, and a resident of New York, in the county and`State o'f- New York, have inventedfcertain new and useful Improvements in Tires,of which the and provides an extra deep trea'd or nose-V portion to minimize the danger of puncture and for other reasons; and so disposes the f rubber of said tread portion and otherwise .so adapts the parts thereof that they-are* prevented from tearing 0H the tire and' overworkng the side-walls at any one place L when in service.

In the drawings,4 I have 'illustrated al -pneumatic shoe within'my invention, Figure l the' tread as, for instance, looking at Fig. 1

- action of said pebble ejector.

from above; Fig. 3 being'a cross-'sectional view on the line 3 3 in Fig. `2 looking in the direction of the arrows; Figs. 4 and 5 are views corresponding respectively to Figs.- '1 and 2 tol illustrate a novel form of pebble ejector;- and Fig.v 6 is an enlarged sectional view on the line 6 6 in `Fi 5, and Fig."7

is the same under load to il ustrate a novel I will now describe the tire of the drawings,freserving it to the claims to point out the novel features and to dene the scopeof the invention, it being understcodxthat the claims will be given the due range of equival lents to which they maybe entitled in view of the art.

The pneumatic shoe illustrated comprises the clencher beads 1,. the canvas layers 2 of the carcass, the rubber zone 3 with its `em' bedded canvas breaker strip 4, and the surrounding rubber tread-or nose-portion 5. It will bevnoted that Ihave made this'tread portion 5 unusually deep for reasons and 'advantages including the following 'lo` guard the inner tube from puncture; also togive such easy riding quality to the tread portion that, without lossl of easy riding quality, the tire can be used when pumped up to maximum air pressure and therefore run under the best condition for long life.A

6 6 are transverse grooves extendlng into the tread portion for substantially its entire depth. Specifically and preferably, these- I" Specication of Letters Patent.Y I

` y Patented Jani.A 9, 1917'. application mea April 1a, m4. serial No. 832,967.

grooves incline across thevlength of the tire i* 1 Vand are helicalor screw-like in form. These grooves provide between them relatively A massive helical bars 7 whose solid, deep -middle portions do the `brunt of the workoin supportingthe load-and in taking the wear, f an Athe sides ofthe tirewhere they reduce in whose end portions extend around to depthl and merge therewith.' lhe outer surface 7 of the`ends-of these bars does not curve continuously with the surface?b of 'their middle portion. 'On the contrary, the

ends ofthe bars are rather abruptly j'ut away (preferably, as shown, on a concave curve) to a lower level where. they leave said mlddle portion, and then continue, asshown, preferably on a convex curve until vthey merge with'the 'convexity ofthe sides of the are. I may in uns .fashion reduce the depth of both ends of each bar adjacent itsmiddle y portion', although 'in the `drawings Ihave onlyattempted to show the idea applied to ends 'of vth'ese bars are beveledl off at y:7c-cn -K their corners and sides, s'o as'to 'merge said ends all the'gmoresuccessfully and gradually the grooves'lA'G-. The walls 7'1 of the grooves 6-f eo nverge mwardl toward each otherv andaroundinto the ottoms. of the grooves.

Theobject of tlie described con/struction of the tread portion is to prevent it-'frol'n j tearing' olf in spite of its great depth 'and f mass. The spaces make the iexibilities right to prevent this', 'as doalso the'concavities at the. ends of the middleportions v011e end of-each`alternately. Further,`the v with the sdes'of the tire and the bottoms of walls 8 of the tire, which it otherwise would v do to the detriment of said sides, causing them to break andnblow-out. -On the `contrary, my improvements so evenly distribute the bendinggwork throughout the sides of obscuring their other features. Thesefins ser\'e to prevent `stones or other small arti-` cles from lodging in the spaces. y

From the sectlonal view Fig. 6 taken on the line 6-6 in Fig. 5, it will be seen that the sides 9a of the pebble ejector closely approach or may even unite at the bottom with the side walls 7l of the tread-bars 7. The object is that the base of the active bars in ground-contact and theejector-ns shall be squeezed into contact when Aunder load (compare the diagrammatic view Fig. 7 to form a unifyin connection and mutual support for said ars and for the portions of vthe carcassbetween them. The result is that the carcass, being supported not only over' the active bars but also over the spaces between them, is prevented from bulging down into said spaces and from being repeatedly bent and worked on itself to lts lnjury as the wheel rotates. Further, the active bars temporarily unified by the fins 9 act collectively in flexing under the drlving, skidding and'other strains, instead of acting as merely spaced apart individuals, with the result that the tendency of the bars to be torn olf the carcass or the carcass to be injured, is correspondingly reduced.

What I claim is:

1.`A pneumatic shoe havin a nose-portion which is generally rounde transversely concaved to a reduced depth at the ends of their ground contacting middle portion, and thence continue around with reductions of depth into merger with the sides of the tire.

3. A pneumatic shoe having a nose-por tion which is generally rounded transversely and which comprises deep, spaced,

transversely disposed rubber bars which are concaved to a reduced depth at the ends of their ground-contacting middle portion, and thence become convex and continue with reductions of depth into merger withthe sides of the tire.

4. A dpneumatic shoe having a nose-portion whlch is generally rounded transversely and which comprises deep, spaced, transversely disposed rubber bars which are decidedly reduced in depth atthe ends of their ground-contacting middle portion, and

.thence continue around to the sides of the 5. A pneumatic shoe having a nose-portion which is generally rounded transversely and which comprises deep, spaced,

ltransversely disposed rubber bars which are decidedly reduced in depth at the ends of their ground-contacting middle portion, and thence continue with reductions of depth into merger with the sides of the tire.

6. A neumatic shoe having a nosepor tion whic is generally rounded transversely and which comprises deep, spaced, transversely disposed rubber bars which are decidedly reduced in cross section at the ends of their ground-contacting middle portion, and thence continue around to the sides 0f the tire.

7. A pneumatic shoe having a nose-portion which is generally rounded transversely and which comprises deep, spaced, transversely disposed rubber bars which are decidedly reduced in cross section at the ends of their ground-contacting middle portion, and thence continue with reductions of cross section into merger with the sides of the tire.

8. A pneumatic shoe comprising its carcass and a transversely generally-rounded, extra deep, protective rubber nose-portion on said carcass, said nose-portion having frequent transverse grooves therein substantially as deep -as itself, the solid portions of the nose between said grooves being weakened by having` portions removed from their outer surface at the ends of their middle ground-contacting portion.

9. A neumatic shoe'comprising its carcass .an a transversely generally-rounded, extra deep, protective rubber nose-portion on said carcass, said noseortion having frequent transverse grooves txherein substan- -tially as deep as itself, the solid portions of the nose between said grooves being weakened by having portions removed from their outer surface at the ends of their middle ground-contacting portion, said solid portions being substantially helically disposed on the carcass.

10. A rubber tire,having a tread-portion with horizontally elongated spaces therein which open to the tread, and elongated walllike ins in 'said spaces extending lengthwise thereof.

11. A rubber tire having a tread-portion with horizontalliy elongated spaces therein which open to t e tread, and wall-like fins in said spaces extending lengthwise thereof, the side walls of said spaces and said fins squeezing into contact at the base when under load.

12. A tire havin side-walls adjacent a central longitudina ly extending opening and having a nose-portion securedy to the lower ends of said side-wa1ls, which is generally rounded transversely and which comprises deep, spaced, transversely disposed rubber bars which are vdecidedly reduced in depth at the ends of their ground-contacting middle portion and thence continue around tothe sides of the tire.

13.'A tire having side-walls adjacent a central longitudinally4 extending opening and having a nose-portion secured Ato the lower ends of said side-walls which is generally rounded transversely and which comprises deep, spaced, transversely disposed rubber bars which are decidedly reduced in depth at the ends of their ground-contacting middle portion and thence continue with reductions of depth into merger with the sides of the tire.

' 14. A pneumatic shoe 'comprising its carcass and a tread portion having deep tread grooves approaching the carcass, and members in such grooves which are gripped between the parts of the tread-portion that are in `ground-contact and support the carcass at the grooves.

15. A rubber tire having a tread-portion with transversely extending, horizontally elongated, open-ended `spaces therein, and wall-like fins in said spaces extending lengthwise thereof, the side walls of said spaces and said ins squeezing into contact at the base when under load.

In testimony whereof I afx my signature in presence of two witnesses.

MAX oYRUs ovERMAN.

Witnesses:

E. W. SCHERR, Jr., FRED E. lLEE. 

